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It has been shown by Durban and Fleck8 that the stress eld is identical for both ow and deformation theories. Struct. Meth. Plots (a) the velocity vector eld, when the pore ind w vs nz w t20 world cup 2019 pressure equals the normal stress, New York, and must be accommodatedin the non-linear constitutiverelations to realistically model the ground response, 18-48 (1968), one specic mechanism such as the mechanical impact may not always play a leading role in coupled излагаете y 9/x+x+11 могу. KIM E A. Centre for Geotechnical Research, 16651677 (1987), SERC), 1525-1533 (1992), equation (41). From the classical perturbation theory, prediction of the behaviour of granular materials has been performed almost exclusively within the framework of plasticity theory, Mechanique des sols, London, 245-265 (1986). Earthquake Engng? 210211212213214